Date: Wed, 29 May 2002 21:39:54 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: Peter Wemm <peter@wemm.org> Cc: Terry Lambert <tlambert2@mindspring.com>, Richard Wenninger <richard@richardw.net>, <current@FreeBSD.ORG> Subject: Re: UMA lock Message-ID: <20020529212412.U24797-100000@gamplex.bde.org> In-Reply-To: <20020529072020.89F16380A@overcee.wemm.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, 29 May 2002, Peter Wemm wrote: > M_NOWAIT to the mbuf m_get*, malloc*, contigmalloc*, uma_* etc means > "you must not tsleep!". M_WAITOK conversely means that tsleep should be > called as needed. Things like malloc still can return NULL even with M_WAITOK > for non-recoverable scenarios. malloc() itself can't do this, unless malloc(M_WAITOK) has been broken. Thousands of callers depend on malloc(M_WAITOK) not returning NULL, and malloc.9 still documents this behaviour. You may be thinking of mbuf allocation. It is confusingly different, starting with the no-wait flag being spelled differently (M_NOWAIT). Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020529212412.U24797-100000>